Q. No.
| A. | the primary source of testosterone or androgens in males |
| B. | male germ cells in the inside lining of seminiferous tubules |
| C. | spermatids released from seminiferous tubules |
| D. | Present in the inside lining of seminiferous tubules, they nourish developing sperm cells |
| 1. | Only A, B, and C | 2. | Only A, B, and D |
| 3. | Only B, C, and D | 4. | A, B, C, and D |
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The spermatids are transformed into spermatozoa by a process called:
| 1. | Spermiation | 2. | Spermatocytogenesis |
| 3. | Spermiogenesis | 4. | Spermatolysis |
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Which of the following helps spermatids in their transformation to sperms?
| 1. | Leydig cells | 2. | Type B spermatogonia |
| 3. | Type A spermatogonia | 4. | Sertoli cells |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Sperms constitute the majority of the volume of the semen ejaculated. |
| Reason (R): | There are about 300 million sperms per ml of the ejaculate. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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| 1. | B and C | 2. | B and D |
| 3. | A and E | 4. | C and E |
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What causes the onset of puberty in males?
| 1. | Increase in secretion of testosterone by the testis |
| 2. | Decrease in the secretion of testosterone by the testis |
| 3. | Increase in secretion of GnRH by the hypothalamus |
| 4. | Decrease in the secretion of GnRH by the hypothalamus |
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Leydig cells synthesize androgens under the direct influence of:
| 1. | FSH | 2. | LH |
| 3. | FSH and LH | 4. | GnRH |
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FSH:
| 1. | Acts on Sertoli cells and stimulates secretion of some factors that help in spermiogenesis |
| 2. | Acts on Sertoli cells and inhibits secretion of some factors that help in spermiogenesis |
| 3. | Acts on Leydig cells and stimulates secretion of some factors that help in spermiogenesis |
| 4. | Acts on Leydig cells and inhibits secretion of some factors that help in spermiogenesis |
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| 1. | Ribosomes | 2. | Golgi Apparatus |
| 3. | Centriole | 4. | Endoplasmic reticulum |
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